Platform memory

Platform memory is the built-in memory provided by model vendors (Claude, ChatGPT, Gemini, Copilot). It is convenient but opaque: storage and eviction policies are controlled by the provider.

Typical behavior: you ask a model to remember a preference, and future sessions may include it. There is rarely an append-only log, typed schema enforcement, or deterministic replay capability.

User: "Remember I prefer morning meetings."
Model platform: stores preference internally
Operator: cannot inspect full lineage, replay state transitions, or export a deterministic log

For production agent workflows, this model typically fails key guarantees in the comparison table (versioning, replay, audit, and deterministic resolution). Compare with retrieval memory and deterministic memory. See also memory model comparison.